Mortar for stamp-mills



(No Model.) 3 Sheets$hee1; 1.

J; 0. BUTTERFIELD.

MORTAR FOR STAMP MILLS.

No. 285,391. Patente'd'Sept. 25,1883.

W itnesses 3 Sheets-Sheet. 2.

(No Model.)

J. G. BUTTERPIELD.

MORTAR FOR STAMP MILLS. No. 285,391. Patented Sept. 25, 1883.

W imesses K MJWM/ da O Attorney.

(No Model.) 3 Sheets-Sheen 3.

J. O. BUTTERFIELD.

MORTAR FOR STAMP MILLS.

Patented Sept. 25, 1883.

Inventor XflVZtnesses PATENT. 'OFFIQEQ JOHN G. BUTTER FIELD,

or CHICAGO, ILLINoIs.

MORTAR FOR STAMP-MILLS.

SPECIFICATION formingpart of Letters Patent No. 285,391, dated September25, 1883.

Application filed May 1 1883.. (No model.)

provement-s, I will particularly describe them,

having reference to the accompanying drawings, wherein Figure 1 is aperspective view of my double sta1np-mill. Fig. 2 is a side elevation ofthe mortar with screen in section. Fig. 3 is a vertical section throughone corner and side of mortar and screen. Fig. 4 is a horizontal sectionof one of the corner-posts. Fig. 5 is a plan of the corner offlange-plate A is the stamp-rod, which may be actuated by any propermechanism, and B is the stamp attached to the lower end of said rod.

0 is the die, loosely set in a cell madein the bed-block D, said blockbeing usually of castiron and supported upon a suitable foundation.

In the drawings the stamp is shown in connection with and operated bythe atmospheric machine for which Letters Patent Nos. 17 6, 400 and230,611 have been granted to me; but it is to be understood that myimprovement set forth herein is entirely independent of said machinery,and that therefore I do not propose to limit myself to the means foractuating the stamps shown in said patents.

The die G is set loosely in its cell and bedded in sand in the ordinaryway. As its surface is worn away, it becomes necessary occasionally toraise it up, and it is also desirable to remove the sand bedding fromtime to time to recover the precious metals which work down into thesame. I therefore make a groove, E, in the bed-block at the bottom ofthe cell, and extend the same out through the front of said bed-blockand terminate it in a pitcher, lip, or spout, F. A lifting-bar may beinserted within said groove E, to raise-the die 0 out of its cellsufficiently far to enable the attendants to grapple and lift itentirely out, or to permit a thorough washing of the sand and slime outof the cell and from the sides of the same. Vhile the die is in use, thegroove E is stopped with a plug, M. Then the surface of the die has beenworn away, its level may be restored by placing under it a plate ofiron, and this may be repeated as often as necessary until the die hasbeen worn so thin as to be no longer serviceable. The

plates may then be removed and a new die substituted.

The bed-block D is provided with a surrounding-trough, H, which it isconvenient to cast separate from said block and attach by bolts. Thistrough passes entirely around the upper margin of the bed-block, and itsbottom surface is arranged to drain toward an outletspout, I, from whichthe slime is conducted away to the apparatus for further treatment.

The bed-block D is'surmounted by a screenframe composed of corner piecesor posts and a cap-plate or cover, K, and these parts are designed tofit together and be united by corner bolts, so as to give the greatestsecurity and firmness of union. Each post consists, essentially, of ahollow part, Z, having a lozengeshaped crosssection. This part Zextendsthe whole length of the screen-frame and constitutes the post proper.Its top and bottom surfaces are inclined to the direction of the sides,so as to permit the post to stand with an outward inclination to makethe top of the screen-frame larger than the bottom. The lower end of thepost Z stands upon the upper flange, m, of the bed-block D, and thecorner of the cover-plate K rests upon its upper end. The whole isfirmly tied together at the corners by the bolts a, which pass downthrough the cover, the hollow posts Z, and through the flange m, and aresecured by nuts at each end.

Beneath the upper nut I have placed a cupshaped plate, 1), and washer q,of leather or india-rubber, for the purpose of preventing displacementof said nut by the concussion of the et-ribs are cast upon thebase-plate in proper position. v

From the advance or outer corners of each post Z two longitudinalflanges, r, extend at right angles to each other. Then when the severalcorner-posts are in place the several flanges r constitute perpendicularand parallel marginal flanges extending outwardly, as shown, to receivethe edges of the screen-frames S.

At the outer edge of each of the flanges 1'' there is a'marginal hook orreturning-flange, t, forming a recess or groovefor the taper key U,which is used to wedge the edge of the screen frame S firmly against theface of the post 7, and therefore hold it securely in place.

Outside of the screens S, I place removable cover-plates V, which may beamalgamated on their inner surfaces to prevent loss of the fine orewhich passes through the meshes of the screen. As these cover-plateswill require frequent removal for cleansing, I secure them in place bythe cam-latches 0c, whi ch are pivoted to the sides of the flanges 1-.The cover-plate K has suitable openings for the passage of the stamp rodor rods A and for the feed-chute y. On said plate, surrounding eachstamprod opening, I place a funnclshaped cup, 2, the upper edge of whichis turned over inwardly, so as to form an overhanging hollow flange, andon one side of said cup, close under said flange, I make an inlet, a,for water, so ar ranged that the water shall enter the cup 2 in ahorizontal direction, or thereabout, and ina linetangential to the innerperiphery under said flange; or the flange may be carried over so far(see dotted lines, Fig. 3) as to constitute a hollow water-conduit, fromwhich the water may be discharged in converging streams cov ering theinner surface of the cup. I prefer, however, the tangential discharge,as being less liable to obstruction. The effect of this is to cause thewater to flow down the inner surface of the funnel z and pour on allsides of the stamp-rod as it moves up and down, so as to keep it washedclean of slime, and the surface being kept wet with water at a point sohigh as the funnel 2, which is immediately below the guide-box b, saidbox is thereby constant-1y lubricated.

Having described my invention, what I claim as new is 1. In combinationwith the flanged bed-block provided with the ribs i and the cover-plate,the hollow lozenge-shaped corner-posts Z, each provided with thehooking-flanges r t, fitted to engage with said ribs z, and the tie-rodsa, as set forth- 2. A mortar for stamp-mills, consisting of abase-block,D, provided with a die, 0, hollow corner-posts 1,. provided with flangesand hooks t, coverplate K, and bolts 12, combined with the screen-framesS and taper keys U, substantially as set forth.

3. A mortar for stamp-mills, consisting of a bed-block, D, provided witha die, 0, a coverplate, K, and corner-posts Z, provided with flanges 1-t, and cam-latches x, bound togetherby the bolts a, and combined withthesereenframes S, taper keys U, and cover-framesWV, substantially forthe purpose set forth.

4. The mortar for a stamp-mill, provided with a cover-plate, K, having afunnel-shaped cup mounted thereon, surrounding the stamprod, and awater-inlet, combined with a stamp rod, and a guide-box for the same,located close down upon or near to said funnel-shaped cup, whereby thewater poured upon said stamprod from said cup will clean said rod andlubri cate said box, substantially as set forth;

JOHN C. BUTTERFIELD.

\Vitnesses:

R. D. 0. SMITH, J. G. TURNER.

